Figure 2.

Materials, designs, and fabrication processes of the headband wearable system. (A) Photographs of the fabricated headband EOG system, integrating a flexible wireless circuit and an array of nanomembrane electrodes. (B) Illustrations of a subject who wears the wearable EOG device, showing the exact location of the two-channel electrodes. (C) Photograph of the flexible circuit with integrated chips for EOG signal detection and wireless transmission via Bluetooth. (D) Photographs of the fractal-patterned gold electrode on a soft fabric, connected to the circuit via a thin-film cable. (E) Fabrication processes of the gold electrode using polymer coating, thin-film deposition, and laser cutting.